Metalliferous monoazo dyestuffs



Patented Sept. 29, 1953 UNITED STATES PATENT "OFFICE METALLIFEROUS MONOAZQDYESTUFFS Christian Zickendraht, Blnningen, and Robert Wittwer, Basel, Switzerland; assignors tofiiba Limited, Basel, Switzerland, a Swiss firm No Drawing. Application October 15, 1951;51:-

rial No. 251,456. In Switzerland November 1,

' 7 Claims.

compounds of ortho-hydroxyazo dyestufis which contain two sulfonic acid groups and correspond to the formula wherein R represents a substituted or unsubstituted benzene radical.

The new metal compounds can be obtained by treating monoazo dyestuffs containing two sulionic acid groups and corresponding to the general formula (1) with an agent providing one of the metals numbered 27 and 29 in they periodic system.

The metal-free monoazo dyestuffs of the general formula (1) are known. The process of their manufacture from diazotized 2-amino-1- hydroxybenzene 4,6 disulfonic acid and 1- phenyl-3-methyl-5-pyrazolones is likewise known.

As 1 phenyl 3 methyl pyrazolones there can be used such compounds as 1-(4- methylphenyl) 3 methyl 5 pyrazolone, preferably 1 (2',5' dichlorophenyl)? 3 methyl 5 pyrazolone, 1 (3- or 4' chlorophenyl) 3 methyl 5 pyrazolone, 1 (2'- chlorophenyl) 3 methyl 5 pyrazolone, and 1 henyl 3 methyl 5 pyrazolone.

The conversion of the dyestuffs into their copper and cobalt compounds can be brought about with the crude products, i e. in the form in which they are present in the coupling mixture. Alternatively, the dyestuff may first be filtered or purified, for example by recrystallization or by dissolving it and precipitatin it from its solution.

The agents providing metals of the atomic numbers 27 and 29, that is agents yielding cobalt or copper are preferably used in the form of salts which contain the metals named as cations, such for example as cobalt acetate, cobalt sulfate, copper sulfate, copper acetate. Inmany cases it is of advantage to use complex metal compounds, e. g. in the form of metal-amine complexes, such as copper tetramine sulfate orin the. form :of. compounds which contain one a of the" said :metals in-complex union in the anion. e. g. complex cobalt or copper compounds of the alkali salts of aiiphaticzaminccarboxylic acids or of the alkali salts of aliphatic .hydroxy carboxylic acids, such as of glycine, lactic-acid, and principally tartaric acid, for example sodium copper tartrate.

The treatment with the. agents providing metal can be conducted according to known methods, e. g. by heatingtotemperatures between 50 and 120 C. in an open vessel, e. g. with reflux cooling or, if desired, in a closed vesselunder pressure, the pH being such as indicated by the nature of the metallizing process; for example, acid coppering with-copper sulfate, and alkaline coppering with copper tetraminesulfate. If desired, other substances, as for example, alcohol may be added.

As regards the metallizing process, with the dyestufis to be used here, a rather short treatment period at a. temperature of to C.

with salts such as acetates or sulfates may suf- The new metalliferous dyestuffs :can be worked up in the usual manner.

The new dyestuffs obtained by the instant process are complex metal compounds containing oneof the metals copper or cobalt in complex union-with monoazo' dyestuffs of the general formula 0H OH I (LN-R .HOfi- N=NC O=N iHa OaH wherein R hasthe significance indicated in connection with Fbrmtfla 1.

The new complex copper and cobalt compounds are suitable for dyeing materials of animal origin. vHowever, they areprlmarily suitable ior'dyeing anodically oxidized aluminum on which they produce dyeings which are especially fast to light.

The following examples illustrate the invention, .the. parts and percentages being by weight.

"Example 1 .47,6 I parts I of the sodium salt of the dyestufi "from, diazotized. 2-amino-l-hydroxybenzene-4,6

from ammonia, pyridine, or monoethanolamine, d-ls lfo ic acid and 1 phenyl'-3-methy1'-5-pyare dissolved at "IO-75 C. in 150 parts of water and to the resultant solution there are added 120 parts of a copper sulfate solution containing 7.8 parts of copper. The whole is stirred at 7075 C. for 30 minutes and the completely precipitated copper complex then separated by filtration. The cupriferous dyestuff so obtained is mixed with 40 parts of water and 30 parts of a 30% sodium hydroxide solution and the resultant paste dried under reduced pressure. The cupriferous dyestuff obtained in this manner is a. yellow-brown powder which readily dissolves in water with a yellow-brown coloration and dyes anodized aluminum golden yellow shades of very good fastness to light.

For dyeing anodized aluminum the new dyestuffs can be used as explained below:

A piece of pure aluminum, anodically oxidized as usual in a sulfuric acid electrolyte with 1.5 amperes per square decimeter, is treated for half an hour at 65 C. in a dyebath containing 0.05 to 0.2 gram per liter of the dyestuiT. A brilliant golden shade is obtained whose fastness to light after the usual sealing operation in boiling water is excellent.

The aflinity of the dyestuff can be increased by an adjustment of the pH value of the dyebath to through the addition of e. g. grams per liter of crystallized sodium acetate and 1 cc. per liter of 40% acetic acid.

A similar copper compound is obtained by employing 1 (4 chloro) phenyl 3 methyl- S-pyrazolone or 1 (2,5 dichloro) phenyl 3- methyl 5 pyrazolone instead of l phenyl 3- methyl-5-pyrazolone in the above example.

Example 2 on OH an Hols N=NC Ci. 5H:

ar stirred with 20 parts of crystallized sodium acetate in 500 parts of water and dissolved by heating to 70 C. 120 parts of a cobalt sulfate solution containing 7.1 parts of cobalt are added and the whole is stirred for 30 minutes at '70 to 75 C. The cobalt complex is precipitated by the addition of 140 parts of sodium chloride, filtered and dried. It is a brown powder which readily dissolves in water with an orange coloration and dyes anodized aluminum golden yellow shades.

A similar cobalt complex is obtained by this method when the sodium salt of the dyestuff from diazotized 2-amin0-1-hydroxybenzene-4,6-disulfonic acid and l-phenyl-3-methyl-5pyrazolone is used as starting material.

What we claim is:

1. A complex metal compound which contains one of the metals selected from the group consisting of cobalt and copper in complex combination with a monoazo dyestufi containing two sulfonic acid groups and corresponding to the formula wherein R. stands for a benzene radical.

2. A complex copper compound of a monoazo dyestuff containing two sulfonic acid groups and corresponding to the formula wherein n represents a whole number which is at most 3.

3. A complex cobalt compound of a monoazo dyestuif containing two sulfonic acid groups and corresponding to the formula H OH wherein n represents a whole number which is at most 3.

4. The complex cobalt compound of the monoazo dyestuff containing two sulfonic acid groups and corresponding to the formula 6. The complex copper compound of the monoazo dyestufi of the formula on E O H035 N=NC I C=N in.

References Cited in the file of this patent UNITED STATES PATENTS 5 7. The complex cobalt compound or the monoazo dyestufi of the formula OH OH N- 5 Number 1,216,813 H038 N N C I ('11 1,959,507 2,165,034 (3H3 2,421,315 2,443,226 03H 10 2,512,251

CHRISTIAN ZICKENDRAHT. ROBERT WITTWER.

Name Date Jagerspacher Feb. 20, 1917 Straub et a1 May 22, 1934 Daudt et a1, July 4, 1939 Carson May 27, 1947 Carson June 15, 1948 Kleene June 20, 1950 

1. A COMPLEX METAL COMPOUND WHICH CONTAINS ONE OF THE METALS SELECTED FROM THE GROUP CONSISTING OF COBALT AND COPPER IN COMPLEX COMBINATION WITH A MONOAZO DYESTUFF CONTAINING TWO SULFONIC ACID GROUPS AND CORRESPONDING TO THE FORMULA 